JP5254577B2 - Insulated wire manufacturing apparatus and manufacturing method - Google Patents

Description

  The present invention relates to an insulated wire manufacturing apparatus and method, and more particularly to an insulated wire manufacturing apparatus and method including an electron beam irradiation device.

2. Description of the Related Art Conventionally, techniques for irradiating a resin-coated portion (insulator) of an insulated wire that has passed through an extruder with an electron beam to promote crosslinking are generally known (see, for example, Patent Documents 1 and 2 below).
JP-A-5-345324 JP-A-6-290650

  A conventional insulated wire manufacturing apparatus equipped with an electron beam irradiation device to promote cross-linking has the following problems. That is, in order to satisfy the characteristics required for electric wires, the insulator after coating the conductor must be irradiated with a high-energy electron beam. There is a problem that the equipment becomes large.

  The reason for irradiating the insulator with a high-energy electron beam is that the characteristics required as an electric wire cannot be obtained unless the electron beam is transmitted through the insulator and crosslinked, and if the energy is insufficient, This is because problems such as heat resistance and wear resistance are caused.

  In addition to the above, the conventional insulated wire manufacturing apparatus has the problem that the electron beam irradiation apparatus is large and expensive, leading to an increase in the cost of the product. In addition, there is a problem that a sufficient space for installing a large-sized electron beam irradiation apparatus and a sufficient space considering safety must be secured.

  The present invention has been made in view of the above-described circumstances, and even if an electron beam irradiation device is provided, it does not become a large facility, and an insulated wire manufacturing apparatus and manufacturing that can efficiently irradiate an electron beam. It is an object to provide a method.

Apparatus for manufacturing the insulated wire of the present invention according to claim 1, wherein has been made to solve the above problems, a conductor supply device, outside the extrusion to extrusion coating the insulator of the conductive member to be supplied from the conductor supply unit insulation comprising a machine, a cooling water tank insulator to cool the insulated wire to be coated, said an electron beam irradiation device for crosslinking the insulator, and a take-up wire winding apparatus for winding the crosslinked insulated wire In wire manufacturing equipment,
Wherein the extruder, the pellets for electron beam irradiation apparatus for semi-crosslinking the pellet was irradiated with electron beam of an amount less than the necessary and sufficient dose to crosslink relative pellets is introduced into the extruder Provided,
The electron beam irradiation device, an insulating irradiating the amount of electron beam smaller than the necessary and sufficient dose to crosslink the remaining fraction to the insulator partially crosslinked state after the coating at the extruder It is provided as a body electron beam irradiation device.

Moreover, the manufacturing method of the insulated wire of this invention of Claim 2 made | formed in order to solve the said subject bridge | crosslinks with respect to the pellet thrown into an extruder using the electron beam irradiation apparatus for pellets provided in the said extruder . A first step of semi-crosslinking the pellet by irradiating an electron beam in an amount less than a necessary and sufficient amount for irradiation ;
After kneading the semi-crosslinked pellets in the extruder, the second step of extruding to the outside of the conductor to coat the conductor in a partially crosslinked state,
A third electron beam is irradiated with an amount of electron beam that is smaller than the irradiation amount necessary and sufficient to crosslink the remaining portion of the insulator covered with the conductor with the electron beam irradiation device for insulator using the insulator electron beam irradiation device. Process,
It is characterized by manufacturing.

  According to the present invention having such a feature, although the number of times of electron beam irradiation is increased as compared with the irradiation of a high-energy electron beam, the dose of each of the electron beam irradiation device for pellets and the electron beam irradiation device for insulators Becomes sufficiently small to provide a total energy-saving manufacturing apparatus and manufacturing method. Even in the case of irradiation with a low-energy electron beam, if it is configured as in the present invention, the characteristics required for an insulated wire can be obtained. According to the present invention, it is possible to reduce the size of the electron beam irradiation apparatus itself, and it is also possible to avoid excessive irradiation of the electron beam.

  According to the present invention described in claims 1 and 2, even if an electron beam irradiation device is provided, it does not become a large facility, and an insulated wire manufacturing apparatus and manufacturing that can efficiently irradiate an electron beam. There is an effect that a method can be provided.

  Hereinafter, description will be given with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an embodiment of an insulated wire manufacturing apparatus and manufacturing method according to the present invention. 2 is a schematic configuration diagram showing another embodiment, and FIG. 3 is a schematic configuration diagram of a comparative example.

  In FIG. 1, reference numeral 1 indicates a manufacturing apparatus for manufacturing an insulated wire 2. The manufacturing apparatus 1 includes a conductor supply device (not shown), an extruder 3, a cooling water tank 4, an electron beam irradiation device 5, and an electric wire winding device 6. The extruder 3 is a device that coats an insulator on the outside of the conductor 7 while passing the conductor 7 supplied from the conductor supply device, and is configured such that the insulator becomes an insulator 8 in a partially crosslinked state. Has been.

  The configuration of the extruder 3 will be described in detail. The extruder 3 includes one configuration of the electron beam irradiation device 5, and a hopper 10 into which pellets 9 of a base resin composition (polyethylene, vinyl chloride, etc.) are placed. A hopper 12 for containing the blended pellets 11; an electron beam irradiation device 13 for pellets that irradiates the pellets 9 with electron beams; and a pellet merging section 15 for merging the half-crosslinked pellets 14 and the blended pellets 11; The screw cylinder 16 knead | mixes and extrudes the half-bridge pellet 14 and the mixing | blending pellet 11 and the crosshead 17 which coat | covers the resin extruded from this screw cylinder 16 on the outer side of the conductor 7 are comprised.

  The extruder 3 includes the electron beam irradiation device 13 for pellets as one configuration of the electron beam irradiation device 5 (it is an example, and shows a case not included in FIG. 2). ing. Further, the extruder 3 is characterized in that the semi-crosslinked pellets 14 are supplied to the screw cylinder 16 and the insulator covering the outside of the conductor 7 in the crosshead 17 becomes the partially crosslinked insulator 8. .

  The electron beam irradiation apparatus 5 includes the above-described electron beam irradiation apparatus 13 for pellets and the electron beam irradiation apparatus 18 for insulator provided after the cooling water tank 4. The pellet electron beam irradiation device 13 and the insulator electron beam irradiation device 18 are devices capable of irradiating a low energy electron beam, respectively. Each of the electron beam irradiation device 13 for pellets and the electron beam irradiation device 18 for insulators is a small device.

  In the present invention, the device configuration is such that the amount necessary to promote crosslinking is irradiated separately by the electron beam irradiation device 13 for pellets and the electron beam irradiation device 18 for insulators. This apparatus configuration is different from the conventional apparatus that irradiates a high-energy electron beam with one apparatus or the apparatus shown in FIG. 3, and this is a feature of the present invention.

  In the present invention, the electron beam irradiation device 13 for pellets applies an amount of electron beam (low energy electron beam: for example, 60 kV) smaller than the necessary irradiation amount (a necessary and sufficient irradiation amount for crosslinking) to the pellet 9. Irradiation becomes a device for obtaining a semi-crosslinked pellet 14, and the insulator electron beam irradiation device 18 irradiates the remaining crosslinked electron beam 8 with a remaining electron beam (low energy electron beam: for example, 60 kV). Thus, it is a device that mainly bridges the insulator surface.

  Next, the flow until the insulated wire 2 is completed based on the above configuration will be briefly described.

  When the pellet 9 of the base resin composition is put into the hopper 10, the pellet 9 passes through the inclined portion 19 that is continuous with the hopper 10. When the pellet 9 is irradiated with a low-energy electron beam at the position of the inclined portion 19 using the electron beam irradiation device 13 for pellets, a half-bridged pellet 14 is obtained, and this half-bridged pellet 14 is transferred to the pellet junction 15. (For example, this is the first step for manufacturing).

  The semi-crosslinked pellets 14 are kneaded by the extruder 3 together with the blended pellets 11 put into another hopper 12 and then extruded at the crosshead 17 portion. As a result, the insulator 8 in a partially crosslinked state is coated on the outside of the conductor 7. Since the partially-crosslinked insulator 8 has already been promoted to be cross-linked, it is semi-crosslinked, so that the characteristics as an electric wire can be improved when it is covered with the conductor 7 (for example, up to this point in the second manufacturing process). Process).

  After being extruded from the extruder 3 and passing through the cooling water tank 4, when a low energy electron beam is irradiated to the partially crosslinked insulator 8 using the insulator electron beam irradiation device 18, the partially crosslinked insulation is obtained. Cross-linking of the surface of the body 8 is particularly promoted, thereby improving the wear resistance and heat resistance required for the electric wire. Thereafter, the insulated wire 2 is wound around the wire winding device 6 to become a product (for example, this is the third step related to manufacturing).

  As described above with reference to FIG. 1, according to the present invention, even if the electron beam irradiation device 5 is provided, a large facility is not provided, and an electron beam can be efficiently irradiated. ing.

  Next, another embodiment will be described with reference to FIG. In addition, the same code | symbol shall be attached | subjected to the same structure fundamentally as FIG.

  The manufacturing apparatus 21 in FIG. 2 includes a conductor supply device (not shown), an extruder 22, a cooling water tank 4, an electron beam irradiation device 5, and a wire winding device 6. The extruder 22 is a device that coats an insulator on the outside of the conductor 7 while passing the conductor 7 supplied from the conductor supply device, and is configured such that the insulator becomes the insulator 8 in a partially crosslinked state. Has been.

  The configuration of the extruder 22 will be described in detail. The extruder 22 includes a hopper 23 for putting the half-crosslinked pellets 14 and the blended pellets 11, and a screw cylinder 16 for kneading and extruding the half-crosslinked pellets 14 and the blended pellets 11. And a cross head 17 that covers the resin 7 extruded from the screw cylinder 16 on the outside of the conductor 7.

  The semi-crosslinked pellets 14 are preliminarily separated in a separate process using the pellet electron beam irradiation apparatus 13 and have a smaller amount of electron beam (low energy electron beam: for example, a necessary and sufficient irradiation amount for crosslinking). 60 kV). The electron beam irradiation apparatus 5 is configured to include the pellet electron beam irradiation apparatus 13 used in a separate step in advance and the insulator electron beam irradiation apparatus 18 (for example, 60 kV) provided after the cooling water tank 4. ing.

  Also in the case of FIG. 2, it does not become a large-sized installation, and can irradiate an electron beam efficiently.

  Next, a manufacturing apparatus as a comparative example will be described with reference to FIG. Comparing the manufacturing apparatus of FIG. 3 with the examples of FIGS. 1 and 2, it can be seen how the present invention is a small facility.

  In FIG. 3, the manufacturing apparatus 31 is a large facility equipped with a large electron beam irradiation device 32. The large electron beam irradiation device 32 is a device that can irradiate a high-energy electron beam (for example, about 1000 kV), and is large enough that it cannot be installed in the insulated wire production line 33. Therefore, the insulated electric wire 34 before bridge | crosslinking is manufactured in the insulated wire manufacturing line 33 previously, and after conveying the insulated electric wire 34 before this bridge | crosslinking to another line 35, it is high energy using the large electron beam irradiation apparatus 32. The insulated wire 36 is manufactured by irradiating an electron beam to promote crosslinking.

  The large electron beam irradiation device 32 needs to cross-link the insulated wire 34 before cross-linking to the inside of the insulator. Since it is also necessary to crosslink evenly, excessive irradiation is performed.

  As described above with reference to FIGS. 1 to 3, according to the present invention, although the number of times of electron beam irradiation is increased as compared with the irradiation of a high energy electron beam, the electron beam irradiation device 13 for pellets, Each irradiation amount of the electron beam irradiation device for insulator 18 becomes sufficiently small, so that a manufacturing apparatus and a manufacturing method of energy saving are obtained in total. Even in the case of irradiation with a low energy electron beam, if it is configured as in the present invention, the characteristics required for an insulated wire can be obtained.

  According to the present invention, it is possible to reduce the size of the electron beam irradiation apparatus itself, and to avoid excessive irradiation of the electron beam.

  In addition, it goes without saying that the present invention can be variously modified without departing from the spirit of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which shows one Embodiment of the manufacturing apparatus and manufacturing method of the insulated wire of this invention, (a) is a flowchart which shows a manufacture process, (b) is a block diagram of a manufacturing apparatus. It is the schematic which shows other one Embodiment, (a) is a flowchart which shows a manufacture process, (b) is a block diagram of a manufacturing apparatus. It is the schematic of a comparative example, (a) is a flowchart which shows the manufacture process of a comparative example, (b) is a block diagram of the manufacturing apparatus of a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus 2 Insulated electric wire 3 Extruder 4 Cooling water tank 5 Electron beam irradiation apparatus 6 Wire winding apparatus 7 Conductor 8 Partially crosslinked insulator 9 Pellet 10 Hopper 11 Compounding pellet 12 Hopper 13 Electron beam irradiation apparatus for pellet 14 Semi-crosslinking 15 Pellet junction 16 Screw cylinder 17 Crosshead 18 Insulator electron beam irradiation device 19 Inclined portion 21 Production device 22 Extruder 23 Hopper 31 Production device 32 Large electron beam irradiation device 33 Insulated wire production line 34 Insulation before cross-linking Electric wire 35 Another line 36 Insulated wire

Claims (2)

Crosslinking the conductor supplying device, the extruder extrusion coating an insulator on the outside of the conductors to be supplied from the conductor supply device, a cooling water bath for cooling the insulated electric wire insulator is covered, the insulator In an insulated wire manufacturing apparatus comprising: an electron beam irradiation device for carrying out; and a wire winding device that winds up the crosslinked insulated wire,
Wherein the extruder, the pellets for electron beam irradiation apparatus for semi-crosslinking the pellet was irradiated with electron beam of an amount less than the necessary and sufficient dose to crosslink relative pellets is introduced into the extruder Provided,
The electron beam irradiation device, an insulating irradiating the amount of electron beam smaller than the necessary and sufficient dose to crosslink the remaining fraction to the insulator partially crosslinked state after the coating at the extruder An insulated wire manufacturing apparatus characterized by being provided as a body electron beam irradiation apparatus. First step of semi-crosslinking the pellet by irradiating an amount of electron beam smaller than a necessary and sufficient irradiation amount for crosslinking using a pellet electron beam irradiation device provided in the extruder for pellets to be fed into the extruder When,
After kneading the semi-crosslinked pellets in the extruder, the second step of extruding to the outside of the conductor to coat the conductor in a partially crosslinked state,
A third electron beam is irradiated with an amount of electron beam that is smaller than the irradiation amount necessary and sufficient to crosslink the remaining portion of the insulator covered with the conductor with the electron beam irradiation device for insulator using the insulator electron beam irradiation device. Process,
A method for producing an insulated wire, comprising:

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